Cycle driving mechanism.



m. 629,765. Fatented Aug-1,1899.

H. BUCHNER. CYCLE DRIVING MECHAMSM.

(Application Med. Jan. 17, 1899,) (No Model.)

I UNITED V STATES PATENT OFFICE.

HANS BUOHNER, OF MUNICH, GERMANY;

CYCLE DRlVlNG M ECHANISM.

SPECIFICATION forming part of Letters Patent No. 629,765, dated August1, 1899. Application filed January 17, 1899. Serial No. 702,386. (Nomodel.)

To all whom itmay concern:

Be it known that I, HANS BUCHNER, a citizen of Germany, and aresident ofMunich, Germany, have invented certain new and useful Improvements inCycle Driving Mechanpassesfrom one roller upon the other, each crank isprovided between the rollers with a fixed oval guide d. These guides arenotched ism, of which the following is a specification.

This invention relates to a driving mechanism for cycles in which eachcrank is provided with at least two rollers, placed at different radialdistances from the axle and successively engaged by the treadles, so asto limit the play of the latter while providing alarge length ofcrank-arm for the dowustroke.

In the accompanying, drawings, Figure l is a side elevation of a bicycleprovided with my improved driving mechanism. Fig.2 isa plan thereof, andFig. 3 a detail of the cranks.

To the outer end of each of thecranks e is se-' cured anantifriction-roller a, upon which the treadle h, pivoted to the frame atb, is adapted to bear. During the downstroke the treadle will press uponthe roller to turn the crank and thus rotate the axle f; but to thusturn a crank of the necessary length the stroke of the treadle wouldhave to he of a length which is not in proportion to the length of thehuman leg. In order, therefore, to limit the stroke of the treadle, Isecure to the outer end of each crank a second antifriction-roller c,which is placed radially" nearer to the axle f than the roller a.

This second roller 0 will engage the treadle h during the lower portionsof the stroke and will raise it to be again received upon the roller a.

To avoid any jolting while the treadle for the reception of the rollers,and will thus cause a smooth gliding of the treadle from one roller uponthe other.

WhatI claim is A 1. A cycle driving mechanism composed of a crankprovided with a pair of rollers placed at difierent radial distancesfrom the axle, and of a treadle adapted to successively engage saidrollers, substantially as specified.

2. A cycle drivingmechanisnl' composed of a crank provided with a pairof rollers placed at different radial distances from the axle,

and a curved guide between the rollers, com- I bined with a treadleadapted to successively engage the rollers, substantially as specified.

G. MONROE Boron, EMIL HENZEL.

